This document discusses international sales indicators and prepaid ticket advice. It provides information on different types of international sales indicators like SITI, SOTO, SITO, and SOTI which indicate where a ticket was sold and issued in relation to the starting point of travel. It also describes what a prepaid ticket advice is, which allows someone to purchase a ticket in one city that can then be picked up by the traveler in another city. The benefits of prepaid ticket advice for travel agents and customers are outlined as well.